Given sin(a) = 7/25 and sin(b) = 12/13
using the sum and difference identities determine the value of
sin(a - b)
sin (a + b)=sin a cos b
cos a sin b
(you may assume angles a and b exist in the first quadrant)

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step-by-step explanation:

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

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